| 摘要 |
The unit consists of at least one first cam (3) with a reversible function and at least one second cam (4) which acts as a main cam, operated by a motor (2) through first and second kinematic circuits (6, 7), the second one having two different operating positions. It also has commutators (2a, 5) which act on the first and second kinematic circuits and are able to engage either the first or second circuit. The drive is in the form of a synchronous electric motor (2), and at least one of the kinematic circuits is in the form of a gear train. In addition, the reversible cam has a positon detector (21) which is connected to the motor through a control module (P).
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